Please discuss here all your remarks and pose your questions about all racing series, except Formula One. Both technical and other questions about GP2, Touring cars, IRL, LMS, ...
after highly-success of Mercedes-Benz in Formula 1, Mercedes-Benz will trying for WEC GTE Pro expansion in the future. All WEC GT classes needs more manufacturers to create competitiveness. The deserved car of Mercedes-Benz GTE Pro car is Mercedes-Benz AMG GT cars.
With the collapse of LMP1 does it not make sense to relaunch the GT1 class with silhouette rules but mandate that they use the engines in the road cars? This would mean actually seeing cars with no pedigree actually out on track (Pagani, Keonigsegg) as well as those with returning to the track (Porsche, McLaren, Ferrari) plus maybe a few oddballs (Renault, Aston Martin).
So to answer your question, yes. Mercedes-Benz would, especially with their F1 powered hypercar.
No. WEC has a fierce competitor in the form of Formula-E. Not in racing (the FE's are very underpowered and it only looks great because of the rock-hard tires and short street circuits) but in marketing.
For a normal budget they can be part of a well marketed racing series with a green label right where their customers live, work and shop. Not even F1 can beat that.
And tech wise (running your product for 24h straight) isn't been seen as a huge challenge anymore.
WEC will slowly drop down as a gentlemans racing class in bulletproof porsches and ferraris.